Plasma-curable offset printing ink composition, method for producing printed matter using same, and printing method

Abstract

A plasma-curable ink composition for offset printing having high reactivity with plasma and capable of being hardened into a sufficiently dried state even in the use of plasma generated by a remote-type plasma generator, and a method for producing printed matter and a method for printing information using the same. The plasma-curable ink composition for offset printing comprises a pigment, a binder resin, and at least one specific ingredient selected from the group consisting of castor oil, polymerized oil, and alkyd resins having an acid value of 10 mg KOH/g or more.

The invention claimed is: 
     
       1. An ink composition comprising:
 a pigment; 
 a binder resin; and 
 at least one specific ingredient selected from the group consisting of castor oil, polymerized oil, and alkyd resins having an acid value of 10 mg KOH/g or more, wherein 
 a reactivity of the ink composition is configured so that the ink composition is curable by a remote-type plasma which is generated at a site remote from a target substrate and is carried on flowing plasma gas to the target substrate and applied onto the target substrate for offset printing, wherein 
 the content of the specific ingredient is 2.5 mass % or more and 14 mass % or less of the entire composition. 
 
     
     
       2. The ink composition curable by the remote-type plasma for offset printing according to  claim 1 , wherein the polymerized oil is boiled oil. 
     
     
       3. The ink composition curable by the remote-type plasma for offset printing according to  claim 1 , wherein the polymerized oil is at least one selected from the group consisting of polymerized soybean oil, polymerized linseed oil, polymerized castor oil, polymerized and dehydrated castor oil, and polymerized tung oil. 
     
     
       4. A method of producing printed matter, comprising the steps of:
 preparing an ink composition comprising a pigment, a binder resin, and at least one specific ingredient selected from the group consisting of castor oil, polymerized oil, and alkyd resins having an acid value of 10 mg KOH/g or more, a reactivity of the ink composition configured so that the ink composition is curable by a remote-type plasma which is generated at a site remote from a target substrate and is carried on flowing plasma gas to the target substrate and applied onto the target substrate for offset printing, 
 printing information on the target substrate with the ink composition, and 
 irradiating the printed substrate with the remote-type plasma for curing to fix the ink composition present on a surface of the target substrate, wherein 
 the content of the specific ingredient is 2.5 mass % or more and 14 mass % or less of the entire composition. 
 
     
     
       5. The method of producing printed matter according to  claim 4 , wherein the remote-type plasma is generated by supplying a discharge space between two electrodes with a stream of air, oxygen, nitrogen, carbon dioxide, or any mixture thereof. 
     
     
       6. The method of producing printed matter according to  claim 4 , wherein the polymerized oil is boiled oil. 
     
     
       7. The method of producing printed matter according to  claim 4 , wherein the polymerized oil is at least one selected from the group consisting of polymerized soybean oil, polymerized linseed oil, polymerized castor oil, polymerized and dehydrated castor oil, and polymerized tung oil. 
     
     
       8. A method of producing printed matter, comprising the steps of:
 preparing an ink composition comprising a pigment, a binder resin, and at least one specific ingredient selected from the group consisting of castor oil, polymerized oil, and alkyd resins having an acid value of 10 mg KOH/g or more, a reactivity of the ink composition configured so that the ink composition is curable by a remote-type plasma which is generated at a site remote from a target substrate and is carried on flowing plasma gas to the target substrate and applied onto the target substrate for offset printing, 
 printing information on the target substrate with the ink composition; and 
 irradiating a surface of the printed ink composition with the remote-type plasma to fix the ink composition on the target substrate, wherein 
 the content of the specific ingredient is 2.5 mass % or more and 14 mass % or less of the entire composition. 
 
     
     
       9. The method of producing printed matter according to  claim 8 , wherein the polymerized oil is boiled oil. 
     
     
       10. The method of producing printed matter according to  claim 8 , wherein the polymerized oil is at least one selected from the group consisting of polymerized soybean oil, polymerized linseed oil, polymerized castor oil, polymerized and dehydrated castor oil, and polymerized tung oil. 
     
     
       11. The method of producing printed matter according to  claim 8 , wherein the remote-type plasma is generated by supplying a discharge space between two electrodes with a stream of air, oxygen, nitrogen, carbon dioxide, or any mixture thereof.